Grinding-mill.



F. T. H. GOODWIN.

GRINDING MILL.

AFPLICATION FILED FEB. 25. 94.

y PatentedApr. 6, 1915.

INVE. NTO R WITNESS ES TTORN EYS THE NORRIS FETERS CQ, PHDTO-LITHO.. WASHINGTDN D. C.

FREDERICK THOMAS I-IENRY GOODWIN, OF LONGTON, STOKE-UPON-TRENT, ENGLAND.

GRINDlNG-MILL,

Specification of Letters Patent.

Patented Apr. 6, 1915.

Application filed February 25, 1914. Serial No. 820,904.

To all whom it may conccm:

Be it known, that I, FREDERICK THOMAS HENRY GOODWIN, subject of the King of Great Britain, residing at Erskine House, Longton, in the borough of Stoke-upon- Trent, England, have invented certain new and useful Improvenents in Grinding-Mlls, of which the following is a specification.

This invention has for its object to provide improved means for the grinding or milling of potters and like materials Whereby the same are prepared for the manufacture ot, for instance, pottery.

Referring to the accompanying sheet of explanatory drawings, the Figure is a diagramnatic vertical section of apparatus con structed in accordance With this invention.

A fixed pan or like receptacle a has a sleeve b projecting from the center of its base or closed end and extendng above the level of the pan outflow. Through the said sleeve passes the upright shaft c which is supported in foot step and other bearings (Z and e and is rotated in any ordinary manner. Upon the upper portion of the shaft is secured the boss f (or an extension of the boss) of the upper grinding element, the said element comprising (as in ordinary grinding mills) the driving arms g radiating from the lower part of the boss, a rim or periphery IL commonly known as the slug iron, and Stones or runners z' disposed between the driving arms. The lower and fixed grinding element j is tormed, in the usual manner, by a stone paving at the bottom of the pan. The stones or runners of the upper grinding element are borne or supported by the said pavement as they are carried around the same by the rotaticn of the driving arms aforesaid.

At the upper end of the pan there is formed or attached an external fiange or gallery or launder 7.2 extending above and below the upper edge of the pan and forming therewith a weir and an annular overfiow trough provided with a discharge connection fitted with a control valve Z or its equivalent.

The boss of the upper grinding element aforesaid is surrounded by a funnel like part m, secured to and rotating with the said boss and having an enlarged upper end serving as a hopper or admisson area for the material to be ground and the water for admixture therewith. The water is admitted through a pipe n and the roughly broken solid material through a pipe 0. From such Copiesof this patent may be obtaned for five cents each, by addressng the Commissioner hopper the solid matter and the water together pass through the annular space formed between the funnel and the boss and thence on to the pavement or lower and fixed grinding element or surface, where the solid matter is subjected to the grinding action set up by the rotation of the upper grindng element over or upon the pavement as aforosaid. It will be observed that the boss f passes over the sleeve Z without touching the same. The contents of the pan cannot escape through the boss and sleeve owing to the fact that the upper end of the sleeve is above the normal level of the fluid in the pan.

The feedingof the material and the water into the pan is regulated to suit the rate of outfiow and the degree of fineness to which the material is to be ground plasticity or fiuidity of the slip or the ground and mixed product which is kept in a state of agitation by the rotation of the upper grinding element, and is caused to flow over and the required the weir formed by the top edge of the pan,

into the annular trough aforesaid and from thence through the delivery connection. During such upward and outwardfiow of the properly ground and mixed product the larger and heavier or imperfectly ground pieces of material will be prevented by gravity from rising tothe top of the pan and will thus return to or remain on the pavement until reduced by the continu'al grinding action. i

Having thus described my invention what I claim as new and desire to secure by Letters Patent is In means for grinding or milling potters or like materials, the combination comprising a grindng pan, a Vertical shaft in the pan, a hollow boss secured to the sha'ft, grinding means secured to the boss, a sleeve projecting upward from the bottom of the pan and passing between the shaft and the boss, a charging funnel secured to and rotating with the boss, an annular trough adapted to receive material by overflow from the pan, and a discharge pipe connected With the trough, substa-ntially as described.

In testimony whereof I have signed my name to this specification in the presence of i two subscribing witnesses.

FREDERICK THOMAS VVitnesses: v

PATTIE PLANT, C. H. W'. FARRAR;

HENRY GOODWIN.

of Patents,

Washington, D. C. 

